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A281331 as a simple table

na(n)
11
21
31
41
51
6691
71
83617
943867
10283
11131
12103
13657931
149349
151721
1637
17151628697551
1826315271553053477373
19154210205991661
20137616929
211520097643918070802691
2259
23383799511
24653
25417202699
26577
2739409
28113161
2967
302003
31157
321226592271
33839
3437
35688531
363112655297839

[1,1,1,1,1,691,1,3617,43867,283,131,103,657931,
 9349,1721,37,151628697551,26315271553053477373,
 154210205991661,137616929,1520097643918070802691,
 59,383799511,653,417202699,577,39409,113161,67,
 2003,157,1226592271,839,37,688531,3112655297839]